Specifications

TD-W8950N 150Mbps Wireless N ADSL2+ Modem Router User Guide
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• Option 125: The option 125 allows DHCP server to be pre-configured with policy for
handling classes of devices in a certain way without requiring DHCP server to be able to
parse the unique format used in client-identifier option.
 Use the following IP Address: If you are provided with a static IP/gateway Address, please
select this option, and then enter the WAN IP Address, WAN Subnet Mask and WAN
gateway IP Address manually.
5. You will see the next screen as below. You can enable the NAT, SPI Firewall, and IGM P
Multicast, if you are not sure about the settings, just leave the default settings. Click Next.
Figure 4-16
 Enable NAT: This technology translates the IP addresses of a local area network to the WAN
IP address for the Internet. If this router is hosting your network’s connection to the Internet,
please select the check box. If another router exists in your network, you don’t need to select
the option.
 Enable Firewall: A SPI firewall enhances network’s security. Select the option to use a
firewall, or else without a firewall.
 Enable IGMP Multicast: This is enabled by default. This setting will not allow IGMP (Internet
Group Management Protocol) packets to be forwarded to the LAN. IGMP is used to manage
multicasting on TCP/IP networks. Most users will not need to enable this. Some ISPs use
IGMP to perform remote configuration for client devices, such as the router. If you are unsure,
check with your ISP.

Note:
If you select the Enable NAT checkbox, the NAT menu will be added to the Web-based Utility. We
will describe the detailed configuration in 4.4.5 NAT
.